This one affected a lot of people traveling to the 2021 US Grand Prix in Austin & it supposedly didn't affect Southwest [my Alaska flight was cancelled after four hours of "any minute now"]:
Southwest flies all the flights it markets, they do not contract regional carriers for any flights like all of the airlines SkyWest is contracted by.
Regional carriers typically operate smaller aircraft with less senior crew and sorta serve to expand the mainline carriers markets and also often serve to feed the mainline carriers experienced pilots for their mainline aircraft.
Regional carriers typically operate smaller aircraft with less senior crew and sorta serve to expand the mainline carriers markets and also often serve to feed the mainline carriers experienced pilots for their mainline aircraft.